The disclosure is directed towards systems and methods for improving security in a computer network. The system can include a planner and a plurality of controllers. The controllers can be deployed within each zone of the production network. Each controller can be configured to assume the role of an attacker or a target for malicious network traffic. Simulations of malicious behavior can be performed by the controllers within the production network, and can therefore account for the complexities of the production network, such as stateful connections through switches, routers, and other intermediary devices. In some implementations, the planner can analyze data received from the controllers to provide a holistic analysis of the overall security posture of the production network.